KR101462807B1 - Wind tunnel testing apparatus for simultaneous measurement of drag force and lift force - Google Patents

Abstract

The present invention relates to a wind tunnel testing apparatus that is capable of effectively analyzing lift, drag, and a lift-drag ratio (lift/drag) by simultaneously measuring the lift and the drag produced by shapes, angles of attack, wind speeds, and Reynolds number of various objects. The present invention realizes a wind tunnel structure that is capable of ensuring a uniform flow rate by rectifying a fluid and a novel wind tunnel testing apparatus that uses a link combination between a lift load cell and a drag load cell, a computer for digitization of measured values, and the like, and thus the lift and drag produced in the objects in various testing conditions can be measured at the same time, the lift and the drag can be turned into numerical values, and the lift-drag ratio can be calculated based thereon so that performances of the objects can be analyzed efficiently.

Description

[0001] The present invention relates to a wind tunnel testing apparatus for simultaneous measurement of drag force and lift force,

The present invention relates to a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force, and more particularly, to a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force generated in various shapes of objects, angle of attack, wind speed, and Reynolds number, To a wind tunnel test apparatus capable of effectively analyzing rain (lift / drag).

In general, a wind tunnel test apparatus is a device that artificially makes a uniform air flow, and examines the influence of a flow on an object, the movement of an object in a flow, and a change in a flow due to an object placed in a flow.

That is, a wind tunnel test apparatus is a device that causes air to flow artificially to investigate the phenomenon of air flow, the force of the air flow on the object, or the motion of the object in the flow.

Such a wind tunnel test system can change the model systematically compared with direct measurement using a real object, so it can be experimented in various cases inexpensively, safely and easily.

In the early days, it was used in the design and research of airplanes. Now, the design of automobiles, railway cars, bicycles and ships, the effect of wind on the structures such as high-rise buildings, towers and bridges, turbulence caused by mountains ), And the like.

For example, in the field of aircraft, the force of air acting on a gas such as lifting force, drag force, and moment is measured by using a scale model of an aircraft or an actual airframe as it is, Measure the aerodynamic characteristics of the wings or the various wing shapes.

This wind tunnel test system is used in experiments to determine the air resistance of an aircraft or an automobile, or to determine the most suitable aerodynamic shape, and to experiment with a scale model that resembles a real one. There is also a large wind tunnel that can be tested as it is.

In addition, supersonic wind tunnel is used for the tests of supersonic aircraft, rocket, space suntrack, etc., and it is also used for experiments in the fields of architecture, weather, and pollution such as high-rise buildings, wind conditions around mountains and smoke spread in chimneys.

Such a wind tunnel test apparatus is disclosed in Korean Patent Laid-open Nos. 10-2002-0037174, Korean Patent Laid-Open Nos. 10-2006-0003629, Korean Patent Laid-open Publication No. 10-2007-0113715, Korean Patent Laid- .

The experimental apparatus that is currently commercialized in relation to the lift and drag force is simply to visually check the phenomenon of the wind passing through the wing or to measure the approximate force using a weight.

Even though the load cell and the pressure measuring system are used, the lift and drag measurement can not be performed at the same time. Therefore, the experimental apparatus for lift measurement and the experimental apparatus for drag measurement must be separately designed.

This is not only detrimental to the efficiency of the experiment, but also requires an analysis of the efficiency of the airfoil if the two devices are not all equipped. Efficiency is not known unless the lift and drag are analyzed together in any shape.

In addition, theoretical analysis of lift and drag is impossible in the experimental apparatus that can not be quantified, and numerical analysis is necessary to find out and improve the problem of the apparatus by analyzing the precision of the experimental value.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a wind tunnel structure capable of ensuring a uniform flow rate by rectifying a fluid, a combination of a lift load cell and a drag load cell, By implementing a new type of wind tunnel experiment device, it is possible to simultaneously measure the lift and drag force generated in an object under various experimental conditions, numerically measure the lift and drag force, calculate the port ratio, and efficiently analyze the performance of the object The present invention provides a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force.

In order to achieve the above object, a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force provided by the present invention has the following features.

A wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force according to the present invention comprises a blower and a wind tunnel for blowing wind to a measuring section where an object is located and a wind tunnel for supporting an object located at the rear end of the wind tunnel, And a measuring unit capable of simultaneously measuring lifting force and drag force of the object through a combination of a lifting load cell and a drag load cell which are operated in conjunction with each other by movement.

Therefore, the wind tunnel test device capable of simultaneously measuring the lift and drag force is a lift and drag force measuring device that can test an object under various conditions. It is an experiment for lift and drag force of aeronautics and fluid engineering related researchers and researchers Low cost and high efficiency.

Here, the measurement unit of the wind tunnel test apparatus capable of simultaneously measuring the lift and the drag may include an object support plate for supporting an object to be winded at a windward rear end position, a lift load cell coupled to a lower end of the object support plate for measuring an object lift, A slide mechanism that is coupled to a lower end of the lifting load cell and that allows the whole of the lifting load cell including the object supporting plate to move back and forth; a slide mechanism that is located on the rear side of the lifting load cell, And a drag force load cell.

The wind tunnel test apparatus capable of simultaneously measuring the lift and the drag force is composed of an instrument panel electrically connected to the lifting load cell and the drag load cell and displaying the lift and drag values measured by the load cell in numerical values, The computer may further include a computer that displays the measured value transmitted through the measured value as the lift coefficient curve and the drag coefficient curve, as well as calculating the portability ratio and displaying the measured value.

In a preferred embodiment of the present invention, a circular hole is formed in the object support plate of the measurement part, and a circular plate having an object fixed to the hole is rotatably installed, and the angle of attack of the object is adjusted by adjusting the rotation angle of the circular plate. And the object support plate of the measurement unit is fixed to the lift load cell at two points forward and rearward and is inserted into the slot in the wind tunnel so that the object support plate can restrict the rotation and the left and right movement of the object, And the slide mechanism of the measuring unit may be installed at an angle of 1 to 5 degrees with respect to the horizontal line, preferably at an angle of 3 degrees, for smooth contact between the lift load cell side and the drag load cell side.

As a preferred embodiment of the present invention, it is possible to further include a plurality of pier plates and a honeycomb structure installed in the wind tunnel sequentially back and forth to rectify the fluid, and a plurality of pier plates installed in the wind tunnel at this time The lid can be replaced with a perforated plate having holes of different dimensions.

In the case of the wind tunnel, a structure including an enlarged chamber whose cross section is enlarged toward the rear side, a stagnating chamber formed between the enlarged chamber and the plurality of perforated plates in succession, and a stagnation chamber whose cross- ≪ / RTI >

Meanwhile, the wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force according to the present invention has a configuration in which a blower, a wind tunnel and a measurement section, and an instrument panel are set as one assembly on a case, Lt; / RTI >

The wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force provided by the present invention has the following advantages.

First, by having a structure that can simultaneously measure the lift and drag values with one device, it is easy to experiment and fine adjustment of the angle of attack of the object is possible, so that the lift coefficient, drag coefficient, and portability ratio can be obtained for various objects at the angle of attack , And it is possible to change the wind speed and the Reynolds number so that the experiment can be performed under various conditions.

Secondly, it is possible to analyze effectively the performance of the object by numerically checking lifting and dragging force generated in the object under various experimental conditions and by calculating the portability ratio of the object.

Third, by experimentally designing and producing an object directly, the experimenter can experiment with lift and drag at low cost and high efficiency. You can help.

1 is a perspective view showing a wind tunnel test apparatus capable of simultaneously measuring lift and drag according to an embodiment of the present invention;
2 is a side view showing a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force according to an embodiment of the present invention.
3 is a perspective view showing a perforated plate and a honeycomb in a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force according to an embodiment of the present invention.
FIG. 4 is a perspective view showing a measurement unit in a wind tunnel test apparatus capable of simultaneously measuring lift and drag according to an embodiment of the present invention. FIG.
5 is a side view showing a measurement unit in a wind tunnel test apparatus capable of simultaneously measuring lift and drag according to an embodiment of the present invention.
6 is a side view showing a state of use of a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force according to an embodiment of the present invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force according to an embodiment of the present invention. FIG. 2 is a perspective view showing a wind tunnel test Fig.

As shown in FIGS. 1 and 2, the wind tunnel test apparatus simultaneously measures two forces of lift and drag generated in various shapes of objects, angle of attack, wind speed, Reynolds number, and the like, / Drag) can be analyzed.

For this purpose, the wind tunnel test apparatus comprises a blower 11, a wind tunnel 12, and a lift load cell 13, which operate in conjunction with each other by the movement of an object to be winded, And a measurement unit 10 for simultaneously measuring lifting force and dragging force of the object by using the drag force cell 14 and the like.

The blower 11 is connected to the front end of the wind tunnel 12 and is supported by the blower frame 30 as a means for providing wind at a constant wind speed into the wind tunnel.

The wind tunnel 12 is installed on the wind tunnel frame 31 as a means for blowing wind toward the object located at the rear end.

The wind tunnel 12 includes an enlarged chamber 12a, a stagnation chamber 12b and an alternating chamber 12c which are arranged in order along the longitudinal direction of the wind tunnel. The enlarged chamber 12a has a cross section from the blower discharge side to the back side The stagnation chamber 12b is connected to the expansion chamber 12a to maintain a linear section at a certain distance in an enlarged cross section of the expansion chamber 12a. The above-mentioned diaphragm chamber 12c has a structure in which the cross section gradually decreases from the rear end side of the stagnation chamber 12b to the rear side.

3, the wind tunnel 12 includes a perforated plate 23 and a honeycomb structure 24 as a means for rectifying the fluid and uniformly distributing the flow rate in the measuring unit 10. [

The perforated plate 23 and the honeycomb structure 24 are installed in the wind tunnel 12 in a sequential manner to rectify the fluid. The perforated plate 23 has a plurality of perforated plates 23, And the honeycomb structure 24 is disposed on the rear end side of the turret chamber 12c in the wind tunnel.

Here, the perforated plate 23 is formed in a rectangular plate shape having a plurality of holes, and the front and rear perforated plates 23, which are spaced at a certain distance from each other, have holes of different diameters.

For example, the diameter of the hole formed in the front piercing plate 23 can be about 10 mm, and the diameter of the hole formed in the rear piercing plate 23 can be about 5 mm.

The honeycomb structure 24 is composed of a rectangular lattice-like structure having a plurality of lattice-shaped passages through which wind can pass, so that it is possible to divide the entire cross-section of the progress path of the wind into the same size, To be distributed and distributed.

Accordingly, the wind introduced into the wind tunnel 12 is temporarily stored in the stagnation chamber 12b by the two front and rear perforated plates 23 having holes with different diameters, and then sent to the rear side Shaped flow path of the honeycomb structure 24, the uniform distribution of the flow velocity is achieved in the measuring section 10, and thus the fluid uniformly distributed acts on the object, and lift and drag force .

A detachable lid 25 is provided on one side of the wind tunnel 12, for example, above the trap chamber 12b provided with the perforated plate 23, so that the lid 25 is opened It is possible to replace the perforated plate 23 provided inside the wind tunnel 12 with a perforated plate having holes having different dimensions. As a result, it is possible to change various Reynolds numbers through the replacement of the perforated plate.

In the present invention, the blower 11, the wind tunnel 12, the measuring unit 10, the instrument panel 18, and the like are set as one assembly on the case 26 in order to secure the mobility and portability of the wind tunnel test apparatus It provides the form of

For example, an elongated quadrangular case 26 is provided. On the upper surface of the case 26, a blower 11, a wind tunnel 12, a measuring section 10, and a dash panel The wind tunnel frame 31 and the structure frame 32 can be integrally installed on the case 26 while being structured to be supported by the fan frame 30, the wind tunnel frame 31, the structure frame 32 and the like.

This makes it possible to handle the apparatus in a state in which the blower 11, the wind tunnel 12, the measuring unit 10, the instrument panel 18, and the like are assembled on the case 26, Can be secured.

In the present invention, the lift and drag measured through the load cell are expressed numerically, the lift value and the drag value are represented by the lift coefficient and the drag coefficient curve, and the means for analyzing the performance of the object is calculated by calculating the input port ratio do.

For this purpose, a gauge board 18 is provided which represents the lift and drag values measured in the lift load cell 13 and the drag load cell 14 in grams.

The instrument panel 18 is mounted on the case 26 and is electrically connected to the lift load cell 13 and the drag load cell 14.

Further, a computer 19 is provided for calculating the lift measurement value and the drag measurement value transmitted from the instrument panel 18 by the lift coefficient curve and the drag coefficient curve, as well as calculating the bridge ratio.

The computer 19 is connected to the instrument panel 18 via a USB cable, and receives measurement values.

Through the program coding of the computer 19 at this time, it is possible to implement automation of various analyzes desired by the experimenter.

Here, a method of representing the lift value and the drag value by the drag coefficient curve and the drag coefficient curve through the program coding of the computer, the method of calculating the drag ratio between the lift value and the drag value, and the like are known in the art And can be adopted without particular limitation.

FIG. 4 is a perspective view illustrating a measuring unit in a wind tunnel test apparatus capable of simultaneously measuring lifting force and dragging force according to an embodiment of the present invention. FIG. 1 is a side view showing a measurement section in a wind tunnel test apparatus.

As shown in FIGS. 4 and 5, the measuring unit 10 is a means for simultaneously measuring lifting force and drag force of an object through the movement of an object to be winded at the rear end of the wind tunnel 12.

For this purpose, the measurement unit 10 includes an object support plate 15 for supporting (fixing) an object, a lift load cell 13 and a drag load cell 14 for measuring the lift and drag forces of the object, A slide mechanism 16 for moving the entire lifting load cell 13 including an object, and the like.

The object supporting plate 15 is located inside the rear end of the wind tunnel 12 and supports the wind-receiving object. The object supporting plate 15 is in the form of a rectangular plate and takes a vertical posture parallel to the wind direction.

A support plate bracket 27 such as an angle member or the like is mounted on the lower end of the object support plate 15 and the support plate bracket 27 is fixed to the upper surface of the lift load cell 13, The support plate 15 can be connected to the lift load cell 13 via the support plate bracket 27 so that the movement of the object on the object support plate 15 can be transmitted to the lift load cell 13 side.

A support plate bracket 27 mounted on the object support plate 15 is provided on the side of the lift load cell 13 so as to prevent the rotation of the object support plate 15 and the object mounted thereon, And the upper end and the lower end of the object supporting plate 15 are inserted and positioned in the slot 22 in the longitudinal direction of the wind tunnel formed on the upper and lower surfaces of the wind tunnel 12, So that the rotation of the object supporting plate 15 and the left and right flow can be restrained.

By applying the two-point fixing structure of the object support plate 15 and the insertion structure in the slot 22, the object to be floated by the wind can move in the vertical direction while restricting the rotation and the left and right flow, It is possible to accurately measure lift and drag at the same time.

In particular, the present invention provides a structure capable of adjusting the angle of attack of an object, and the lift and drag force of the object can be measured under various experimental conditions through the adjustment of the angle of attack.

A circular hole 20 is formed in the center of the object supporting plate 15 and the circular plate 21 is fitted in the hole 20 so as to be rotatable with respect to the axis of the circular plate itself do.

On both sides of the disk 21 thus installed, an airfoil object to be subjected to lifting and drag measurement is provided.

In addition, a scale indicative of the angle is displayed on the circumference of the hole 20, so that the rotation angle of the disk 21 can be finely adjusted at an angle of less than 1 DEG, that is, at an angle of less than 1 DEG .

The disc 21 in the hole 20 can be mounted in a structure that can be easily separated and coupled with a fitting structure or a tape or the like and an object provided on the disc 21 can be fixed by an adhesive, It can be fixed.

The lifting load cell 13 is connected to the bottom surface of the supporting plate bracket 27 mounted on the lower end of the object supporting plate 15. The lifting load cell 13 is provided as a means for measuring the lifting force of the object.

Here, the lifting load cell 13 may be a normal load cell used in a wind tunnel test.

The lifting load cell 13 is supported by the load cell support plate 28, and the load cell support plate 28 can be installed on the slide mechanism side.

The slide mechanism 16 is provided as means for moving the entire lifting load cell 13 and the load cell support plate 28 including the object supporting plate 15 on which the object is installed back and forth.

The slide mechanism 16 serves to guide the movement of an object pushed to the rear side by the wind, that is, the movement of the object supporting plate 15 including the object, the lifting load cell 13, and the entire load cell supporting plate 28 do.

The slide mechanism 16 includes a slide rail 16a serving as a stationary body and a slide block 16b serving as a moving body. The slide rail 16a is fixed to the mechanism frame 33 on the case 26 And the slide block 16b is guided along the slide rail 16a and is coupled to the bottom surface of the load cell support plate 28. [

In particular, the slide mechanism 16 at this time is inclined at an angle of 1 to 5 degrees, preferably 3 degrees with respect to the horizontal line, that is, in a state in which the rear side in the longitudinal direction of the slide mechanism is inclined lower than the front side So that smooth contact between the side of the lift load cell 13 and the side of the drag load cell 14 can be achieved.

In other words, the movement of the entire object support plate 15 including the object, the lift load cell 13, and the load cell support plate 28 (movement pushed backward) is accurately performed on the drag load cell 14 side via the rod 17 So that it can be electrolyzed.

By providing the slide mechanism 16 with an inclination angle of about 3 degrees, the load cell support plate 28 supported by the slide mechanism 16 and the rod 17 between the load cell support 28 and the drag force cell 14 Since the rod 17 is connected to the inclined posture, the rod 17 becomes in a dynamic friction state in the static friction, so that a very small value of the drag force can be measured.

Accordingly, the entire object support plate 15, the lift load cell 13, and the load cell support plate 28, including the object, are moved in the direction of the slide block 16a So that it can be moved backward.

A drag force load cell 13 is provided to measure the drag force of the object and the drag load cell 14 is installed on the case 26 while taking a vertical posture at the rear position of the lift load cell 13 And is supported on the front surface of the load cell holder 29.

Of course, the drag load cell 14 at this time can also be applied to an ordinary load cell used in a wind tunnel test.

The rod 17 is provided on the side of the drag force load cell 13, precisely on the side of the drag load cell 14, And is connected between the rear end of the drag force load cell 14 and the rear end of the drag force load cell 14.

Therefore, the use condition of the wind tunnel test apparatus capable of simultaneously measuring lift and drag constituted as described above is as follows.

FIG. 6 is a side view showing a state of use of a wind tunnel test apparatus capable of simultaneously measuring lifting force and drag force according to an embodiment of the present invention.

6, an object 100 of an airfoil is attached to the object support plate 15 of the measurement unit 10 located at the rear end of the wind tunnel 12 on both sides of the disc 21, The load cell 13 for measuring the lift of each of the load cells in the object 10 and the drag force cell 14 for measuring the drag of the object 100 are connected to the instrument panel 18 side, And the instrument panel 18 at this time can be connected to the computer 19 side via a USB cable communication or the like.

In this state, along with the operation of the blower 11, the wind passing through the wind tunnel 12, that is, the expansion chamber of the wind tunnel 12, the stagnation chamber and the interchanging chamber are passed through and the two pier plates 23 and the honeycomb structure The wind that has been rectified while passing through the windshield 24 is uniformly distributed on the object 100 located at the end portion of the wind tunnel and lifting force and drag force are generated on the object 100 of the airfoil receiving the wind.

Subsequently, the object 100 is caused to rise upward by the influence of the wind, and eventually the force (lifting force) for lifting the entire object support plate 15 including the object 100 upward is measured in the lifting load cell 13 And sends it to the instrument panel 18.

At the same time, the object 100 is pushed backward by the influence of the wind, so that the entire object supporting plate 15 including the object 100 is pushed back while being guided by the slide mechanism 26, The drag measurement force of the drag load cell 14 is transmitted to the instrument panel 18 while the backward force of the drag load cell 14 is transmitted to the drag load cell 14 via the rod 17.

The lift value measured in the lift load cell 13 and the drag value measured in the drag load cell 14 are displayed numerically on the instrument panel 18 and the lift value and the drag value are transmitted to the computer 19, In addition to representing the lift coefficient curve and the drag coefficient curve used, the portability ratio can be calculated.

Meanwhile, the wind tunnel test apparatus of the present invention can be utilized for setting an optimal airfoil in the design of an airplane.

For example, the performance of an airplane depends on the characteristics of the airfoil, so it is important to consider the structure and strength of the airfoil when designing the airfoil to adopt an airfoil that can best meet the design requirements.

The performance analysis of the airfoil is one of the most important parts of the development of the airplane.

Therefore, by utilizing the apparatus provided in the present invention, it is possible to utilize various airfoils in various industries in development related fields of the airplane by experimenting with various types of airfoils and acquiring various data and experimentally confirming the designed airfoil.

As described above, according to the present invention, it is possible to provide a structure capable of replacing a perforated plate, an expansion chamber, a stator chamber, an exchange chamber and a honeycomb in a wind tunnel, a structure capable of rotating only an object (airfoil) It adopts the load cell and slide mechanism for the structure which can measure simultaneous lift and drag in the state where there is almost no movement of the object, displays the value of lift and drag measured by the load cell on the instrument panel, By using the method of transmitting the measured value to the computer by using communication, it is possible to numerically check the lift and drag generated in the object under various experimental conditions, and calculate the object ratio of the object numerically, thereby efficiently analyzing the performance of the object can do.

10: measuring part 11: blower
12: wind tunnel 13: lift load cell
14: drag force load cell 15: object support plate
16: slide mechanism 17: rod
18: Instrument cluster 19: Computer
20: Hall 21: Disc
22: Slot 23: Perforated plate
24: Honeycomb structure 25: Cover
26: Case 27: Support plate bracket
28: Load Cell Base Plate 29: Load Cell Base
30: blower frame 31: wind tunnel frame
32: Structure frame 33: Mechanism frame

Claims (10)

An air blower 11 and a wind tunnel 12 for blowing wind to the measuring unit 10 at which the object is located and a wind tunnel 12 for supporting the object located at the rear end of the wind tunnel 12, And a measuring unit (10) capable of simultaneously measuring lifting force and drag force of the object through a combination of the lifting load cell (13) and the drag load cell (14) operating in conjunction,
The measurement unit 10 includes an object support plate 15 for supporting an object to be windward at a windward rear end position, a lift load cell 13 coupled to a lower end of the object support plate 15 to measure an object lift, A slide mechanism 16 coupled to the lower end of the load cell 13 to allow the whole lifting load cell 13 including the object supporting plate 15 to move forward and backward and a slide mechanism 16 located at the rear side of the lifting load cell 13, And a drag force cell (14) connected to the lifting load cell side through the load lock cell (17) to measure the drag force of the object.
delete The method according to claim 1,
A dashboard 18 electrically connected to the lifting load cell 13 and the drag force cell 14 and indicating the lift and drag values measured by the load cell in numerical values and the dashboard 18 connected to the dashboard 18 by cable communication, And a computation unit (19) for computing the measured and transmitted values by using a lift coefficient curve and a drag coefficient curve, as well as calculating an input / output ratio, and a computer (19) for simultaneously measuring lift and drag.
The method according to claim 1,
A circular hole 20 is formed in the object supporting plate 15 of the measuring unit 10 and a circular plate 21 having an object fixed to the hole 20 is rotatably installed. And the angle of attack of the object can be adjusted by adjusting the rotation angle of the wind tunnel.
The method according to claim 1,
The object support plate 15 of the measuring unit 10 is fixed to the lift load cell 13 at two points forward and rearward and is inserted into the slot 22 in the wind tunnel 12 to rotate the object, And a wind tunnel test device capable of simultaneously measuring lifting force and drag force.
The method according to claim 1,
The slide mechanism (16) of the measuring unit (10) is installed in a state of being inclined at an angle of 1 to 5 degrees with respect to a horizontal line for smooth contact between the lift load cell side and the drag force load cell side. Wind tunnel test equipment that can be done.
The method according to claim 1,
Further comprising a plurality of piercing plates (23) and a honeycomb structure (24) installed in the wind tunnel (12) in a back-and-forth sequential manner to rectify the fluid.
The method of claim 1 or claim 7,
Wherein a plurality of pier plates 23 installed inside the wind tunnel 12 can be replaced with perforated plates having holes having different dimensions through the lid 25 in the wind tunnel 12, Wind tunnel test equipment that can measure simultaneously.
The method according to claim 1,
The upper wind tunnel 12 is composed of an expansion chamber 12a having a cross section enlarged toward the rear side, a confluence chamber 12b formed between the enlarged chamber 12a and the plurality of the perforated plates 23, (12b) and an intersecting chamber (12c) in which the cross section decreases toward the rear side.
The method according to claim 1 or 3,
The blower 11, the wind tunnel 12, the measuring unit 10, and the instrument panel 18 are set on the case 26 in the form of one assembly to ensure mobility and portability Wind tunnel test equipment capable of simultaneously measuring lift and drag.

Images